21002166606097 has 2 divisors, whose sum is σ = 21002166606098. Its totient is φ = 21002166606096.

The previous prime is 21002166606017. The next prime is 21002166606101. The reversal of 21002166606097 is 79060666120012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13534386145921 + 7467780460176 = 3678911^2 + 2732724^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21002166606097 is a prime.

It is not a weakly prime, because it can be changed into another prime (21002166606017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10501083303048 + 10501083303049.

It is an arithmetic number, because the mean of its divisors is an integer number (10501083303049).

Almost surely, 2^{21002166606097} is an apocalyptic number.

It is an amenable number.

21002166606097 is a deficient number, since it is larger than the sum of its proper divisors (1).

21002166606097 is an equidigital number, since it uses as much as digits as its factorization.

21002166606097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 326592, while the sum is 46.

The spelling of 21002166606097 in words is "twenty-one trillion, two billion, one hundred sixty-six million, six hundred six thousand, ninety-seven".